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The cosmic microwave background (CMB) is thought to be leftover radiation from the Big Bang, or the time when the universe began. The Cosmic Microwave Background radiation tells us the age and composition of the universe. In cosmology, the cosmic microwave background radiation is a form of electromagnetic radiation discovered in 1965 that fills the entire universe. In view of the importance of cosmic microwave background radiation to the Big Bang model of the universe (no other model has explained CMB quite so neatly), efforts were redoubled in an attempt to definitively prove the connection, first in the form of the Cosmic Background Explorer (COBE) satellite in 1989, and then the Wilkinson Microwave Anisotropy Probe (WMAP) in 2001. The Cosmic Microwave Background Radiation was discovered by accident at the Bell Labs Horn Antenna by Penzias and Wilson in 1965. Discovery of Cosmic Background Radiation In 1965 Arno A. Penzias and Robert W. Wilson of Bell Laboratories were testing a sensitive horn antenna which was designed for detecting low levels of microwave radiation. See what the CMB means for our understanding of the universe in this SPACE.com infographic. While working with microwave communication technology Penzias and Wilson discovered a background noise, uniform in all directions, which they could not account for.
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